Plate holder for X-ray films



H. WAGNER PLATE HOLDER FOR x-RAY FLMs Filed Sept. 27, 1954 g HSM Q b E .a

sept. 16, 1958 .a Y w s United States Patent PLATE HOLDER FOR X-RAY FILMS Hubert Wagner, Erlangen, Germany, assignor to Siemens- Reiniger-Werke Aktiengesellschaft, Erlangen, Bavaria, Germany, a firm Application September 27, 1954, Serial No. 458,571,

Claims priority, application Germany October 2, 1953 7 Claims. (Cl. Z50-68) This invention relates to a dark slide or plate holder for Roentgen or X-ray films of the type in which a pad of an elastic material is provided between the cover of the plate holder and the filling (film and intensifying foils), for ensuring a uniform and reliable engagement between the lling and the bottom of the plate holder when the plate holder is closed.

It is an object of the present invention to provide an elastic pad for dark slides which has a surface of low friction so as to prevent the filling or plate from being exposed to rubbing friction or being dislocated when closing the cover of the dark slide.

Another object of the invention is to provide a pad which is safely prevented from depositing on the inserted foils any particles in the form of fibres or the like which would be depicted on the X-ray photograph.

With these and further objects in view, according to the present invention the elastic material forming the pad is lined with an additional covering layer of low friction, preferably in the form of a non-fuzzing textile fabric consisting of a gauze or leno cloth or a twilled fabric woven from vegetable or animal or synthetic fibres. Such non-fuzzing textile fabrics have a surface of low friction and prevent the elastic filling of the pad from engaging the foils, so that the same cannot cause undesirable friction or deposit particles from its surface on the foils.

Generally speaking, the conventional padding material, i. e., felt, may be used as an elastic material for the pad,

since the fibres of the felt are prevented from depositing on the foils or films by the textile fabric. Preferably, however, crepe rubber is used as an elastic material for the pad. The relatively high friction of rubber in this case is no handicap for using the material, since the surface of the rubber material is covered by a textile fabric of low friction.

Other and further objects, features and advantages of the invention will be pointed out hereinafter and appear in the appended claims forming part of the application.

In the accompanying drawings a now preferred embodiment of the invention is shown by Way of illustration and not by way of limitation.

Fig. l is a plan View of a dark slide or plate holder having the invention applied thereto, and

Fig. 2 is a section on line II-Il of Fig. l.

Similar reference numerals denote similar parts in the different views.

Referring now to the drawings in greater detail, it will be seen that the plate holder comprises `a casing whose side walls 15 are inwardly bent at their upper edge 15 about a frame 1 of L-shaped cross section which is recessed at 1 as shownfor the purpose which will be hereinafter described. A cover 5 is pivoted to the case 1 by hinges 2, 3, 4 and adapted to be locked by means of knife-like locking members 6, 7 which are pivoted to the cover by means of pivot pins 8, 9 and adapted to engage by their free ends under the inwardly projecting ends of holding members 10, 11 secured in the frame 1,

f' 2,852,692 Ice Patented Sept. 16,` 1958 as shown. The downwardly bent rim 5' of cover' 5 engages in therecess 1 of frame 1. A

As will be seen from Fig. 2, an X-ray film 12is embedded in the dark slide between two intensifying. foils 13, 14.

The intensifier foils are urged against the film byr an elastic pad preferably consistingof crepe rubber 16 and a coating or lining 17 of textile fabric fixedly secured to the rubber 16. The pad isurged against the foil 13 by the cover 5 and owing to the provisionY of the .textile fabric 17 the pad will slide smoothly on the intensifier foil. The side 18 of the pad facing the cover 5 is not coated with a textile fabric, but is fixedly secured toV the cover 5 by an adhesive. layer 17 is of black color. f

By way of alternative, the elastic pad-may.` be a separate element of the plate holder which is. not fixedly secured to the cover; In this case, the. side 18 of. the pad facing the cover must also be coated or linediwith a textile fabric, in order that the pad is enabled to slide also on the inner face of the cover.

The covering layer of textile fabric 17 may be secured to the elastic material 16 by gluing or sewing. By way of alternative, it may take they form of a case tightly surrounding the elastic material on all sides. For instance, the latter may be placed in a case of textile fabric as in a pocket. Anyway, it is important that the covering layer is secured to the elastic material so as to avoid relative dislocation.

It will be understood that crepe rubber has a higher elasticity than felt and retains its elasticity even under permanent pressure stress, so that it is ensured that the foils or films are under the required surface pressure even with prolonged use of the plate holder. A type of crepe rubber having a specific gravity not exceeding 0.15 gram per `cubic centimeter proved to be particularly suitable. Preferably a type of crepe rubber is used which is obtained by the expanding or foaming and subsequent vulcanisation of suitable latex mixtures and consists of a porous unicellular mass with nonintercommunicating cells. Crepe rubber with a covering layer of textile fabric is known per se and can be produced in per se known manner by depositing the liquid latex mass on the textile fabric and vulcanizing it thereon in an expanded condition.

While the invention has been described in detail with respect to a now preferred example and embodiment of the invention it will be understood by those skilled in the art after understanding the invention that various changes and modifications may be made without departing from the spirit and scope of the invention and it is intended, therefore, tocover all such' changes and modifications in the appended claims.

I claim:

l. A plate holder for X-ray films, comprising a casing, adapted to accommodate a filling including an X-ray film and intensifier foils, a cover, and an elastic pad of high Preferably, the covering friction provided between the cover and the filling, said pad consisting of a compressible material and a covering layer of a material of low friction provided at least on the side of the compressible material adapted to engage the filling.

2. A plate holder for X-ray films, comprising a casing adapted to accommodate a filling including an X-ray film and intensifier foils, a cover, and an elastic pad of high friction provided between the cover and the filling, said pad consisting of a compressible material and a nonfuzzing textile fabric of low friction material forming a covering layer provided at least on the side of the compressible material adapted to engage the filling.

3. A plate holder for X-ray films, comprising a casing adapted to accommodate a filling including an X-ray film and intensifier foils, a cover, and an elastic pad of vhigh friction provided between the cover and the filling,

said pad consisting of porous rubber and a covering layer of low friction material provided at least on the side of the compressible material adapted to engage the filling.

4. A plateV holder for X-ray films, comprising a casing adapted to accommodate a filling including an X-ray lm and intensiiier foils, a cover, andan elastic pad of high friction provided between the cover and the lling, said pad consisting of porous rubber with non-intercommunieating cells and a covering layer of low friction material provided at least on the side of the compressible material adapted to engage the filling.

. 5. A plate holder for X-ray films, comprising a casing adapted to accommodate a lling including an X-ray film and intensifier foils, a cover, and an elastic pad of high friction provided between the cover and the filling, said pad consisting of porous rubber Whose specific gravity does not exceed 0.15 gram per cubic-centimeter and a covering layer of a material of low friction provided at least on the side of the compressible material adapted to engage the 1ling.`

6. A plate holder for X-ray lms, comprising a casing adapted to accommodate a lling including an X-ray lm and intensifier foils, a cover, and an elastic pad of high friction provided between the cover and the filling, said pad consisting of a compressible material and a covering layer of a material of low friction provided at least on the side of the compressible material adapted to engage the filling, said covering layer being iixedly secured to the compressible material.

7. A plate holder for X-ray lms, comprising a casing adapted to accommodate a illing including an X-ray lm and intensifier foils, a cover, and an elastic pad of high friction provided between the cover and the lling, said pad consisting of a compressible material and a covering layer of black color of a material of low friction provided at least on the side of the compressible material adapted to engage the filling.

References Cited in the tile of this patent UNITED STATES PATENTS 2,494,740 Boucher Jan. 17, 1950 2,566,266 Uhle et al Aug. 28, 195i 2,666,855 Gacki et al. Ian. 19, 1954 

